Debuggers

HyperDbg

HyperDbg is great open-source, hypervisor-assisted, user-mode, and kernel-mode Windows debugger with a focus on using modern hardware technologies. Its use involves some initial setup. After you're done with it, open a Command Prompt and type hyperdbg-cli to start. Read the documentation to learn its commands. :)

x64dbg

Both 32 and 64-bit versions. It also includes plugins and scripts.

Plugins

Plugin name	Description
checksec	Checks for security features in the target
MapoAnalyzer	Pseudo-C decompiler
Multiline Ultimate Assembler	Assembler that makes the reverse engineer's like much easier
OllyDumpEx	Process dumper
ScyllaHide	Must have plugin to deal with anti-debug routines
SlothBP	Put breakpoints at known API functions
SwissArmyKnife	I mainly use it to import .MAP files generated from IDA
xAnalyzer	Analyse API function calls to show you the parameters
xSelectBlock	Adds a widget and a command to easier selecting a block
YaraGen	Generate Yara rules based on code from targets

Scripts

In %AppFolder%\x64dbg\scripts folder, you will also find scripts to help with unpacking.